CODEWITHSUNDEEP
javascriptarraysobjectsearchiteration
Codehan25
Codehan25

Reputation: 3014

How to check whether a specific string occurs as a value in an object?

I have an object that is structured like this (simplified version):

{
  "customConfig": {
    "homepage": {
      "url": "path/to/homepage",
      "base_path": "www.stackoverflow.com"
    },
    "portfolio": {
      "url": "path/to/portfolio",
      "base_path": "www.github.com"
    },
    "moreStuff": {
        //...
    }
}

Now I want to check whether a specific string value (in my case for the key base_path) exists.

So how can I check whether, for example, the string www.github.com exists in my customConfig object for the key base_path?

A boolean return value would be enough here.

Upvotes: 0

Views: 115

Answers (7)

Codehan25
Codehan25

Reputation: 3014

I solved it like this (simplified) :)

const specificValueExists = (url: string): boolean => {
    return Object.values(myObject).indexOf(url) > -1;
);

Thanks for all suggested solutions.

Upvotes: 0

trincot
trincot

Reputation: 350137

You could use a recursive function.

To find a certain key, call hasOwnProperty (or use includes on Object.keys) at each nesting level to see if the key is found there.

To find a certain value, use includes on Object.values().

To find a key/value pair, find the key (as above) and verify that the value for that key is the searched value:

const containsKey = (obj, key) => Object(obj) === obj && (
    obj.hasOwnProperty(key) ||
    Object.values(obj).some(child => containsKey(child, key))
); 

const containsValue = (obj, value) => Object(obj) === obj && ( 
    Object.values(obj).includes(value) ||
    Object.values(obj).some(child => containsValue(child, value))
); 

const containsKeyValue = (obj, key, value) => Object(obj) === obj && (
    obj.hasOwnProperty(key) && obj[key] === value ||
    Object.values(obj).some(child => containsKeyValue(child, key, value))
); 

// Example run:
let data = {
  "customConfig": {
    "homepage": {
      "url": "path/to/homepage",
      "base_path": "www.stackoverflow.com"
    },
    "portfolio": {
      "url": "path/to/portfolio",
      "base_path": "www.github.com"
    },
    "moreStuff": {
        //...
    }
  }
};

console.log(containsKey(data, "base_path")); // true
console.log(containsValue(data, "www.github.com")); // true
console.log(containsKeyValue(data, "base_path", "www.github.com")); // true

Upvotes: 1

navnath
navnath

Reputation: 3714

To check whether some value exists in customConfig object based on key of customConfig.

let data = {
  "customConfig": {
    "homepage": {
      "url": "path/to/homepage",
      "base_path": "www.stackoverflow.com"
    },
    "portfolio": {
      "url": "/to/portfolio",
      "base_path": "www.github.com"
    }
  }
};

// create array for url and base_path; which will simplify to search based on key
const result = Object.keys(data.customConfig).reduce((acc, key) =>{
  const {url, base_path} = data.customConfig[key];
  acc['url'].push(url);
  acc['base_path'].push(base_path);
  return acc; 
} , {url:[], base_path: []});

//to search in url
const x = result['url'].includes('/to/portfolio');
console.log(x);

//to search in basepath
const y= result['base_path'].includes('www.stackoverflow.com');
console.log(y);

Upvotes: 1

vaira
vaira

Reputation: 2270

Iterative looping in case property value is array or object.

Object.values(obj) will turn arrary and object values in a array of values where we can iterate over the values

let data = {
    "customConfig": {
        "homepage": {
            "url": "path/to/homepage",
            "base_path": "www.stackoverflow.com"
        },
        "portfolio": {
            "url": "path/to/portfolio",
            "base_path": "www.github.com"
        }
    }
}
// self recursive function loop 
let hasValue = (obj, value) => {
  return   Object.values(obj).some(s => {
        if (s === value) {
            return true;
        }
        if (typeof s === 'object' || Array.isArray(s)) {
            return hasValue(s, value);

        }
        return false;
    });
}

console.log(hasValue(data, "www.stackoverflow.com"));

Upvotes: 1

malarres
malarres

Reputation: 2946

A regular expression could be of use here:

const x = {
  "customConfig": {
    "homepage": {
      "url": "path/to/homepage",
      "base_path": "www.stackoverflow.com"
    },
    "portfolio": {
      "url": "path/to/portfolio",
      "base_path": "www.github.com"
    },
    "moreStuff": {
        //...
    }
  }
  }

const regex = /base_path\":"www\.github\.com/

const t = regex.test(JSON.stringify(x.customConfig))

console.log(t)

Upvotes: -2

Peter Seliger
Peter Seliger

Reputation: 13366

The OP needs to utilize Object.values in order to retrieve an array of all the config object's property values. Then the OP wants to know if some condition like such a value's/item's base_path value equals a certain address.

console.log(
  "does object contain an item where `base_path` equals 'www.github.com' ?",
  Object.values({
      "homepage": {
        "url": "path/to/homepage",
        "base_path": "www.stackoverflow.com"
      },
      "portfolio": {
        "url": "path/to/portfolio",
        "base_path": "www.github.com"
      },
      "moreStuff": {
          //...
      }
    }).some(item => item.base_path === 'www.github.com')
);

Upvotes: 2

Vineesh
Vineesh

Reputation: 3782

You can try something like

let obj = {
  "customConfig": {
    "homepage": {
      "url": "path/to/homepage",
      "base_path": "www.stackoverflow.com"
    },
    "portfolio": {
      "url": "path/to/portfolio",
      "base_path": "www.github.com"
    }
    }
}

let exist = Object.keys(obj.customConfig).filter(page => obj.customConfig[page]['base_path'] == 'www.github.com').length>0;

console.log(exist);

Upvotes: 1

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